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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Commitments for Operating Leases [Table Text Block]
The following table summarizes our minimum commitments under noncancelable operating leases having initial terms in excess of one year, primarily for property:
 
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
Minimum commitments(a)
$
294

 
$
280

 
$
249

 
$
196

 
$
166

 
$
482

Sublease income
(62
)
 
(61
)
 
(57
)
 
(45
)
 
(39
)
 
(210
)
Net minimum commitments
$
232

 
$
219

 
$
192

 
$
151

 
$
127

 
$
272

__________
(a)
Certain leases contain escalation clauses and renewal or purchase options.